AbstractThe Flory temperature‐induced volume transition theory for copolymer microgels is generalized for the case of a bimodal heterogeneity of the crosslink density in the microgel particles and applied to PVCL–PNIPAAm and PVCL–PNIPMAAm systems. The most probable morphological parameters are selected from the microscopic and thermodynamic constraints imposed by1H transverse relaxation NMR data and the Flory equation of state in the approximation of a homogeneous morphology. NMR proves the existence of a bimodal heterogeneous morphology of the copolymer microgel particles. Although the systems are different in chemical structure, the heterogeneity parameters obtained from Flory transition theory and NMR transverse relaxation are not essentially different.